Before the trip i was also thinking about getting a big rimowa salsa with 4 wheels because i already had several salsa suitcases with 2 wheels and a smaller salsa (63liters) with 4 wheels.
But: the salsa 4 wheel already weights about 4kg and is way to shiny so ur always worried a little bit about your 300-400€ luggage... Also you just feel immobile when your alwayscarrying a suitcase around. Then u usually overpack it with useless stuff because u don't have to carry it on ur back all the time and then u throw the studf at ur next destination away or send it back and then ur annoyed by ur 3/4 full suitcase